11220720 has 80 divisors (see below), whose sum is σ = 39759360. Its totient is φ = 2564352.

The previous prime is 11220707. The next prime is 11220749. The reversal of 11220720 is 2702211.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 11220720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1660 + ... + 5019.

It is an arithmetic number, because the mean of its divisors is an integer number (496992).

Almost surely, 2^11220720 is an apocalyptic number.

11220720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11220720 is an abundant number, since it is smaller than the sum of its proper divisors (28538640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11220720 is a wasteful number, since it uses less digits than its factorization.

11220720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6702 (or 6696 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 11220720 is about 3349.7343178228. The cubic root of 11220720 is about 223.8756750573.

Adding to 11220720 its reverse (2702211), we get a palindrome (13922931).

The spelling of 11220720 in words is "eleven million, two hundred twenty thousand, seven hundred twenty".